Carbonaceous materials are described, having utility for fluid storage/dispensing. The carbonaceous material in one implementation is a nanoporous carbon composite having porosity that is at least partially filled with material imparting to the composite an enhanced character. Another implementation utilizes porous carbon material as a storage medium for chlorine gas. A further implementation utilizes porous carbon material as a hydrogen storage mediu e g, for hydrogen fuel cells. In another implementation, porous carbon material is employed as a sorbent medium in a fluid storage and dispensing system, in an arrangement of multiple porous carbon articles, and positional stabilization structure is employed to restrain the arrangement against movement. An arrangement in which carbon adsorbent is desorbed of residual fluid by resistive and/or inductive heating of the adsorbent is described.